HELP SUBSCRS Steven Hardy, October 1977
subscrs(integer, string) -> character-code;
character-code -> subscrs(integer, string);
This procedure is used to access strings; if the value of the variable S is a
string then
s(4) =>
is equivalent to
subscrs(4, s)
though the latter will in general be faster.
For example:
'abcd' -> s;
s(4) =>
** 101
101 is the ASCII code for `d`. Character codes can also be found by using the
` symbol, for example:
`a` =>
** 97
The components of a string can be updated, either by treating the string as a
procedure, or by using the updater of SUBSCRS, e.g.
`e` -> s(1);
`f` -> subscrs(2,s);
s =>
** 'efcd'
See also HELP * INITS, *ASCII, *STRINGS.
For super-efficient programs there is a 'fast' version of SUBSCRS, which is
dangerous to use, because it does not check that it has been given the right
arguments. See REF * FASTPROCS;